Do you get enough sleep? With so much homework it's often difficult to get the rest you need. But you need to try， because sleep keeps you healthy and it stops you getting fat.
Recently， a group of US scientists did a study (调查) of kids aged between 8 and 13. The study found that if kids sleep for just one extra (额外的) hour each day, the chance of their getting fat is cut by about 30 percent .
Why? When people don't get enough sleep, they become tired. When they are tired, they don't exercise enough. Also， kids like snacks: If they are awake (醒着的) an extra hour or two each day，they have more time to eat snacks or other unhealthy foods.
So， how much sleep should you get? Scientists suggest 10 to 11 hours a night for kids aged 5 to 12. For older kids, eight to nine hours will do.
小题1:How many reasons are given why people might get fat without enough sleep?

A．3.

B．2.

C．1

D．None.

小题2:If you are under 10， how long do the scientists advice you to sleep?

A．10 to 11 hours.

B．8 to 9 hours.

C．8 to 13 hours.

D．As long as possible.

小题3:Where was the study done by the scientists?
A. In China.        B In Britain.        C. In America.        D. In Japan.
小题4:What does" eight to nine hours will do" mean?
A. Eight to nine hours' sleep will be good and enough.      
B Eight to nine hours' sleep will be too long.
C. Eight to nine hours' sleep will help get fat.
D. Eight to nine hours' sleep will help eat snacks and unhealthy foods.
小题5:What does the passage talk about?
A. How to get long sleep. 
B How to keep fat.
C. Enough sleep makes people healthy and slim (苗条)   
D. Long sleep makes people healthy and slim.

In America, most people don’t get enough sleep. Children aged 5 to 12 are advised to sleep 10 to 11 hours every night, but most of them can’t sleep that long. A study found that about 41 million American workers got less than six hours of sleep every night. Scientists worry that parents are passing their bad sleeping habits down to their children.
In the study, Reut Gruber and some other scientists either added or reduced on hour of sleep for healthy children aged 7 to 11. They watched the children for five nights. They wanted to know if the amount of sleep can affect a child’s behavior.
Before the study began, students were asked to sleep the same amount of hours as usual. Their teachers were asked to record their behavior. After five nights of the records, scientists found that those who slept one hour less behaved worse than those who slept one hour more. Students with less sleep were more likely to feel sad and had more problems paying attention.
The scientists chose to study children in their homes instead of in a laboratory, because they wanted to find out how everyday changes might affect children’s behavior at school. “In the study, nobody became a talent, and nobody became crazy. But small changes in children can really make a big difference,” says Gruber.
小题1: Scientists worry that_______ may cause children to sleep less.

A．too much homework

B．pressure from parents

C．TV and computer games

D．parents’ bad sleeping habits

小题2: Scientists did the new study in order to know_______.

A．why children can’t get enough sleep

B．how long children should sleep every night

C．what children like to do before they go to sleep

D．if the amount of sleep can affect a child’s behavior

小题3: Who helped do some new study, children with less sleep_______.

A．Teachers.

B．Parents.

C．Scientists.

D．Psychologists.

小题4:According to the new study, children with less sleep_______.

A．were more likely to feel excited

B．were more active in playing games

C．had more problems paying attention

D．didn’t want to answer questions in class

小题5:The new study was done in_______.

A．a laboratory	B．a classroom
C．a children’s club	D．the children’s homes

It seems to be strange to you there is a blind spot(盲点)on the eyes,  Here is an interesting experiment(实验)that can make something disappear, when one eye is open.
Make a card about the size of a postcard and write two English letters L and R on it, Lon the left and R on the right. First, hold the card about 80 cm away and you see both the letters.  Then close your right eye and look at the letter R only with your left eye. And now, as you move the card slowly towards you, you' 11 find the letter L disappearing. But if you move the card nearer to your face, the letter will be seen again. Now do the same experiment with your left eye closed, you'll find the letter R disappearing.
Why does the letter disappear? It is because there is a blind spot on the eye. When the image（影像）of the letter falls on the blind spot,  it won't be seen.  That is why either of the letters disappears．
小题1:The writer of the passage thinks that_______ there is a blind spot on the eye.

A．few people know

B．no one knows

C．only you know

D．all the people know

小题2:The word "disappear" in the passage means_______ in Chinese.

A．驱散

B．消散

C．消失

D．遗失

小题3:You fail to see the letter L in the experiment because _______.

A．your eyes are poor	B．its image falls on the blind spot
C．your left eye is not open	D．you move it close to your eye

小题4:In which order(顺序)should you do the experiment?
①Hold the card ②Move the card nearer ③Close your right eye
④write two English letters ⑤Look at the letter R ⑥Make a card

A．④⑥①②③⑤	B．①③⑥④⑤②
C．⑥①④③②⑤	D．⑥④①③⑤②

小题5:The passage mainly tells us_______.

A．how to find the blind spot	B．an interesting experiment
C．where the blind spot is	D．there is a blind spot on the eyes.